Robert lundell



(No Model.)

R. LUNDBLL. GOMMUTATOR BRUSH AND HOLDER. No. 459,367. Patented Sept.8,1891.

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ROBERT LUNDELL, OF NEIV YORK, N. Y., ASSIGNOR OF ONE-HALF TO EDIVARD II.JOHNSON, OF SAME PLACE.

COMMUTATOR-BRUSH AND HOLDER.

SPECIFICATION forming part of Letters Patent No. 459,367,dated September8, 1891. Application filed April 4, 1891. Serial No. 387,606. (Nomodel.)

To all whom it may concern.-

Be it known that I, ROBERT LUNDELL, a citizen of the United States,residing at New York city, county and State of New York;

have invented a certain new and useful Improvement in Commutator-Brushesand Holders, of which the following is a specification.

This invention relates to devices for conducting current from asupply-circuit to the TO armature of an electric motor or to takecurrent from the armature of a dynamo to supply an external circuit.

The main object of the invention is to pro vide current collectors orbrushes which shall i 5 make a perfect contact, shall wear evenly, andshall rest squarely on the surface of the commutator-cylinder, and toprovide an improved brush-holder; and the invention consists in thefeatures and combinations hereinafter described and claimed.

In the accompanying drawings, Figure 1 is an end View of thecommutator-cylinder with four commutator-brush es resting thereon, twoof the brushes and brush-holders being in section. Fig. 2 is a plan viewof one of the collecting-brushes. Fig. 3 is a View of the brushholder,looking in the direction of the arrow in Fig. 1. Fig. 4 is a view of oneof the collecting-rods detached from the holders, and

Fig. 5 is a plan of a modified form.

The commutator-cylinder 1 may be made in any suitable manner, and anysuitable number of commutator-brushes may be employed. Four such brushesare shown in-Fig. 1, the

upper and lower brushes being of the form shown in Fig. 2 and the othertwo being of the form shown in Fig. 5. Each brush consists of a holder2, in which are one or two rows of holes 3, the holes in one rowalternating with those in the other row, or in which is a single largeopening, as in Fig. 5. These holes, which pass through the body 4: ofthe holder, communicate with slots 5. In each hole in the first form isplaced a round car- 4 5 bon-rod or similar collecting device 6, one endof which bears directly on the face of the commutator-cylinder. Theother ends of said rods are beveled, as indicated at 7. Against thesebeveled ends are placed small copper or other metal caps 8, one end ofwhich is made to correspond in shape to the beveled ends of the rods andthe other end of which is provided with a slot 9, the bottom of which isrounded, as shown.

10 10 are arms projecting from the body of the holder and supporting attheir outer ends a rod or tube 11, secured in place by suitable pins orscrews 12. 13 is a web, also projecting from the body of the holder andhaving notches 14: along its outer edge. 6c

16 are metal springs formed of brass or steel wire. The springs aresupported on the rod or tube 11, and one end of each spring bears in anotch 14, while the otherend presses against the cap 8 of one of therods 6.

In Fig. 5 the several collectingrods are shown as rectangular, all beingplaced side by side in the holder. The blocks 8 are also rectangular andare narrower than said rods, and are held in place by the springs 16. Inthis form, as shown at the left in Fig. 1, the blocks 8 have flat facesresting on the rods, since it is not necessary to hold the rods fromturning bysaid blocks. Each collecting-rod, it will be seen, isindependently movable and is pressed forward by a separate spring. Owingto the form of the cap and the end of the collecting-rod, said rod isprevented from turning. Consequently it retains the same positionrelative to the com in utator-cylinder, and the end bearing on thecylinder is worn away evenly, so that the whole area of the end of eachrod rests flatly on the cylinder.

It will be understood that the commutatorbrushes are supported on anysuitable brackets or arms, by means of which they may be adjusted.

That I claim is 1. The combination of a brush-holder, acurrent-collecting rod supported therein, a 0 grooved cap on the rod,and a spring pressing on the cap and resting in the groove thereof,substantially as described.

2. The combination of a brush-holder, several current-collectin rodssupported therein, 5 a cap having a groove in its outer end on each rod,and a spring resting in each of said grooves and pressing on the caps,substantially as described;

3. The combination of a brush-holder, one too or more current-collectingrods supported therein, a cap for each rod having an end adapted to tita corresponding end of its rod to keep the latter from turning, and aspring pressing on the cap or caps, substantially as described.

4. A brush-holder consisting of a body having one or more holes throughit for the reception of current-collecting devices and having grooves inline With the holes, in combination with current-collecting rods orbrushes in the holes, a grooved cap on each collectingrod, and springsin the grooves of the holder and of the caps and pressing against saidcaps, substantially as described.

5. The combination of a brush-holder, several current-collecting devicesheld therein, a notched web extending from the holder, and severalsprings on a suitable support, one end of each of said springs restingin a notch and the other end of eachof said springs bearing on acollecting device, substantially as described.

6. The combination, in a brush-holder, of a body in which severalcollecting devices are independently supported, a grooved cap on eachcollecting device, arms projecting from said body, a tube or rodsupported by the arms, and springs on said tube or rod and pressing onthe collecting devices, substantially as described.

This specification signed and witnessed this 28th day of March, 1891.

ROBERT LUNDELL.

Witnesses:

CHARLES M. CATLIN, AUGS. HAVILAND.

